安家沟流域坡沟系统坡面径流泥沙特征的研究

Runoff and Sediment Characteristics of Slope Gully System—A Case Study of Anjiagou River Basin

该文以黄土丘陵沟壑区第Ⅴ副区安家沟流域为研究对象,采用1986—2011年坡沟系统地表径流和产沙量指标数据,研究不同土地利用条件下地表产流产沙特性,并分析了时间尺度上地表径流与产沙变化特征。结果表明:不同土地利用类型条件下径流量、产沙量的均值存在差异,且呈现规律性,即在同等降雨条件下灌木小区径流量和产沙量均最小,坡耕地径流量和产沙量均最大;不同土地利用类型小区产流、产沙次数均为坡耕地>人工草地>乔木林地>荒草地>灌木林地;模拟研究时间段内径流量变化趋势结果表明,在时间尺度上,径流量和产沙量变化均呈现y=ax+b(a<0)线性关系,尤其灌木林地的斜率最大。

Taking the hill-gully Loess Plateau V deputy district as the object, using runoff and sediment yield index data of 1986-2011 in slope gully system, this paper have studied surface characteristic of the runoff and sediment yield in different vegetation conditions. And it analyzed changes the surface runoff and sediment yield changes on time scale. The results are as follows.F test value of the runoff and sediment yield were greater than 1, the value of significance level is less than 0.05. The maximum times of production sand is 130 times for farmland, artificial grass is less.The minimum scrubland is only 35 times. Runoff and sediment yield of the slope are less than 0（a〈0）, especially the shrub land slope is the largest.